Sofa



FIG. 1 is a front elevational view of the sofa showing my design.

FIG. 2 is another front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a side view thereof, having an opposite side view being a mirror image thereof; and,

FIG. 5 is a back view thereof.

The broken lines shown are understood to represent stitching. 

The ornamental design for a sofa, as shown and described. 